package com.common.android.utils;

import android.annotation.SuppressLint;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.Locale;

/**
 * 农历相关类
 * <br>Created 2014-8-27 上午9:55:51
 * @version  1.0
 * @author   huangyx		
 * @see 	 
 * Copyright(c) 2009-2014, TQ Digital Entertainment, All Rights Reserved
 */
public class LunarCalendarUtils {
    
    @SuppressLint("SimpleDateFormat")
    private static SimpleDateFormat sdf = new SimpleDateFormat("yyyy年M月d日 EEEEE");
    
	private static long[] lunarInfo = new long[] { 0x04bd8, 0x04ae0,
			0x0a570, 0x054d5, 0x0d260, 0x0d950, 0x16554, 0x056a0, 0x09ad0,
			0x055d2, 0x04ae0, 0x0a5b6, 0x0a4d0, 0x0d250, 0x1d255, 0x0b540,
			0x0d6a0, 0x0ada2, 0x095b0, 0x14977, 0x04970, 0x0a4b0, 0x0b4b5,
			0x06a50, 0x06d40, 0x1ab54, 0x02b60, 0x09570, 0x052f2, 0x04970,
			0x06566, 0x0d4a0, 0x0ea50, 0x06e95, 0x05ad0, 0x02b60, 0x186e3,
			0x092e0, 0x1c8d7, 0x0c950, 0x0d4a0, 0x1d8a6, 0x0b550, 0x056a0,
			0x1a5b4, 0x025d0, 0x092d0, 0x0d2b2, 0x0a950, 0x0b557, 0x06ca0,
			0x0b550, 0x15355, 0x04da0, 0x0a5d0, 0x14573, 0x052d0, 0x0a9a8,
			0x0e950, 0x06aa0, 0x0aea6, 0x0ab50, 0x04b60, 0x0aae4, 0x0a570,
			0x05260, 0x0f263, 0x0d950, 0x05b57, 0x056a0, 0x096d0, 0x04dd5,
			0x04ad0, 0x0a4d0, 0x0d4d4, 0x0d250, 0x0d558, 0x0b540, 0x0b5a0,
			0x195a6, 0x095b0, 0x049b0, 0x0a974, 0x0a4b0, 0x0b27a, 0x06a50,
			0x06d40, 0x0af46, 0x0ab60, 0x09570, 0x04af5, 0x04970, 0x064b0,
			0x074a3, 0x0ea50, 0x06b58, 0x055c0, 0x0ab60, 0x096d5, 0x092e0,
			0x0c960, 0x0d954, 0x0d4a0, 0x0da50, 0x07552, 0x056a0, 0x0abb7,
			0x025d0, 0x092d0, 0x0cab5, 0x0a950, 0x0b4a0, 0x0baa4, 0x0ad50,
			0x055d9, 0x04ba0, 0x0a5b0, 0x15176, 0x052b0, 0x0a930, 0x07954,
			0x06aa0, 0x0ad50, 0x05b52, 0x04b60, 0x0a6e6, 0x0a4e0, 0x0d260,
			0x0ea65, 0x0d530, 0x05aa0, 0x076a3, 0x096d0, 0x04bd7, 0x04ad0,
			0x0a4d0, 0x1d0b6, 0x0d250, 0x0d520, 0x0dd45, 0x0b5a0, 0x056d0,
			0x055b2, 0x049b0, 0x0a577, 0x0a4b0, 0x0aa50, 0x1b255, 0x06d20,
			0x0ada0 };

	public final static String[] nStr1 = new String[] { "", "正", "二", "三", "四",
			"五", "六", "七", "八", "九", "十", "十一", "十二" };

	private final static String[] Gan = new String[] { "甲", "乙", "丙", "丁", "戊",
			"己", "庚", "辛", "壬", "癸" };

	private final static String[] Zhi = new String[] { "子", "丑", "寅", "卯", "辰",
			"巳", "午", "未", "申", "酉", "戌", "亥" };

	private final static String[] Animals = new String[] { "鼠", "牛", "虎", "兔",
			"龙", "蛇", "马", "羊", "猴", "鸡", "狗", "猪" };


	/**
	 * 传回农历 y年的总天数
	 * <br>Created 2014-8-22 下午3:52:16
	 * @param y  年份
	 * @return  y年的总天数
	 * @author       huangyx
	 */
	private static int lYearDays(int y) {
		int i;
		int sum = 348;
		for (i = 0x8000; i > 0x8; i >>= 1) {
			if ((lunarInfo[y - 1900] & i) != 0) {
                sum += 1;
            }
		}
		return (sum + leapDays(y));
	}

	/**
	 * 传回农历 y年闰月的天数
	 * <br>Created 2014-8-22 下午3:54:14
	 * @param y 年份
	 * @return 闰月的天数
	 * @author       huangyx
	 */
	private static int leapDays(int y) {
		if (leapMonth(y) != 0) {
			if ((lunarInfo[y - 1900] & 0x10000) != 0) {
				return 30;
			} else {
				return 29;
			}
		} else {
			return 0;
		}
	}

	/**
	 * 传回农历 y年闰哪个月, 没闰传回 0
	 * <br>Created 2014-8-22 下午3:54:54
	 * @param y 年份
	 * @return 返回闰年闰哪个月, 没闰传回 0
	 * @author       huangyx
	 */
	private static int leapMonth(int y) {
		return (int) (lunarInfo[y - 1900] & 0xf);
	}

	/**
	 * 传回农历 y年m月的总天数
	 * <br>Created 2014-8-22 下午3:56:40
	 * @param y 年份
	 * @param m 月份
	 * @return y年m月的总天数
	 * @author       huangyx
	 */
	private static int monthDays(int y, int m) {
		if ((lunarInfo[y - 1900] & (0x10000 >> m)) == 0) {
			return 29;
		} else {
			return 30;
		}
	}
 
	/**
	 * 传回农历 y年的生肖
	 * <br>Created 2014-8-22 下午3:57:49
	 * @param y 年份
	 * @return y年的生肖
	 * @author       huangyx
	 */
	private static String AnimalsYear(int y) {
		return Animals[(y - 4) % 12];
	}

	/**
	 * 传入 月日的offset 传回干支,0=甲子
	 * <br>Created 2014-8-22 下午3:58:37
	 * @param num 月日的offset
	 * @return 传回干支,0=甲子
	 * @author       huangyx
	 */
	private static String cyclicalm(int num) {
		return (Gan[num % 10] + Zhi[num % 12]);
	}

	/**
	 * 传入年份 offset 传回干支, 0=甲子
	 * <br>Created 2014-8-22 下午3:59:14
	 * @param y 年份
	 * @return 传回干支, 0=甲子
	 * @author       huangyx
	 */
	private static String cyclical(int y) {
		int num = y - 1900 + 36;
		return (cyclicalm(num));
	}
 
	/**
	 * 传出y年m月d日对应的农历.year0 .month1 .day2 .yearCyl3 .monCyl4 .dayCyl5 .isLeap6
	 * <br>Created 2014-8-22 下午3:59:50
	 * @param y 年      
	 * @param m 月
	 * @param d 日
	 * @return 传出y年m月d日对应的农历
	 * @author       huangyx
	 */
	private static long[] calElement(int y, int m, int d) {
		long[] nongDate = new long[7];
		int i = 0, temp = 0, leap = 0;
		// Date baseDate = new Date(0, 0, 31);
		Date baseDate = new GregorianCalendar(0 + 1900, 0, 31).getTime();
		// Date objDate = new Date(y - 1900, m - 1, d);
		Date objDate = new GregorianCalendar(y, m - 1, d).getTime();
		long offset = (objDate.getTime() - baseDate.getTime()) / 86400000L;
		nongDate[5] = offset + 40;
		nongDate[4] = 14;

		for (i = 1900; i < 2050 && offset > 0; i++) {
			temp = lYearDays(i);
			offset -= temp;
			nongDate[4] += 12;
		}
		if (offset < 0) {
			offset += temp;
			i--;
			nongDate[4] -= 12;
		}
		nongDate[0] = i;
		nongDate[3] = i - 1864;
		leap = leapMonth(i); // 闰哪个月
		nongDate[6] = 0;

		for (i = 1; i < 13 && offset > 0; i++) {
			// 闰月
			if (leap > 0 && i == (leap + 1) && nongDate[6] == 0) {
				--i;
				nongDate[6] = 1;
				temp = leapDays((int) nongDate[0]);
			} else {
				temp = monthDays((int) nongDate[0], i);
			}

			// 解除闰月
			if (nongDate[6] == 1 && i == (leap + 1)) {
                nongDate[6] = 0;
            }
			offset -= temp;
			if (nongDate[6] == 0) {
                nongDate[4]++;
            }
		}

		if (offset == 0 && leap > 0 && i == leap + 1) {
			if (nongDate[6] == 1) {
				nongDate[6] = 0;
			} else {
				nongDate[6] = 1;
				--i;
				--nongDate[4];
			}
		}
		if (offset < 0) {
			offset += temp;
			--i;
			--nongDate[4];
		}
		nongDate[1] = i;
		nongDate[2] = offset + 1;
		return nongDate;
	}

	/**
	 * 获取农历日期
	 * <br>Created 2014-8-22 下午4:01:06
	 * @param day 数字日期
	 * @return 农历日期
	 * @author       huangyx
	 */
	private static String getChinaDate(int day) {
		String a = "";
		if (day == 10) {
            return "初十";
        }
		if (day == 20) {
            return "二十";
        }
		if (day == 30) {
            return "三十";
        }
		int two = (int) ((day) / 10);
		if (two == 0) {
            a = "初";
        }
		if (two == 1) {
            a = "十";
        }
		if (two == 2) {
            a = "廿";
        }
		if (two == 3) {
            a = "三";
        }
		int one = (int) (day % 10);
		switch (one) {
		case 1:
			a += "一";
			break;
		case 2:
			a += "二";
			break;
		case 3:
			a += "三";
			break;
		case 4:
			a += "四";
			break;
		case 5:
			a += "五";
			break;
		case 6:
			a += "六";
			break;
		case 7:
			a += "七";
			break;
		case 8:
			a += "八";
			break;
		case 9:
			a += "九";
			break;
        default:
            break;
		}
		return a;
	}
	
	/**
	 * 当前日期解析为农历
	 * <br>Created 2014-8-22 下午4:02:06
	 * @return 当前日期的农历
	 * @author       huangyx
	 */
	public static String ParseDateAll() {
	    // 2013年10月28日 星期一 农历癸巳(蛇)年九月廿四
		Calendar today = Calendar.getInstance(Locale.SIMPLIFIED_CHINESE);
		int year = today.get(Calendar.YEAR);
		int month = today.get(Calendar.MONTH) + 1;
		int date = today.get(Calendar.DATE);
		long[] l = calElement(year, month, date);
		StringBuffer sToday = new StringBuffer();
		try {
		    synchronized (sdf) {
		        sToday.append(sdf.format(today.getTime()));
            }
			sToday.append(" 农历");
			sToday.append(cyclical(year));
			sToday.append('(');
			sToday.append(AnimalsYear(year));
			sToday.append(")年");
			sToday.append(nStr1[(int) l[1]]);
			sToday.append("月");
			sToday.append(getChinaDate((int) (l[2])));
			return sToday.toString();
		} finally {
			sToday = null;
		}
	}
	
	/**
	 * 当前日期解析为农历
	 * <br>Created 2014-8-22 下午4:03:53
	 * @return 当前日期的农历
	 * @author       huangyx
	 */
	// 农历九月廿四
	public static String ParseDate() {
		Calendar today = Calendar.getInstance(Locale.SIMPLIFIED_CHINESE);
		return ParseDate(today);
	}
	
	/**
     * 当前日期解析为农历
     * <br>Created 2014-8-22 下午4:03:53
     * @param calendar 日期
     * @return 当前日期的农历
     * @author       huangyx
     */
	// 农历九月廿四
	public static String ParseDate(Calendar calendar){
		int year = calendar.get(Calendar.YEAR);
		int month = calendar.get(Calendar.MONTH) + 1;
		int date = calendar.get(Calendar.DATE);
		long[] l = calElement(year, month, date);
		StringBuffer sToday = new StringBuffer();
		try { 
			sToday.append(" 农历"); 
			sToday.append(nStr1[(int) l[1]]);
			sToday.append("月");
			sToday.append(getChinaDate((int) (l[2])));
			return sToday.toString();
		} finally {
			sToday = null;
		}
	}
}
